116 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[no. 228. 
F. Shoshonite lava sheet, Lamar River, south of Bison Peak. 
Shoshonose. Contains plagioclase, orthoclase, augite, olivine, magnet- 
ite, and serpentine, with amygdules of zeolite and ealcite. Analysis 
by Eakins, No. 1086. 
G. Shoshonite lava sheet, southeast fork of Beaverdam Creek. 
Shoshonose. Contains plagioclase, orthoclase, augite, and serpentin- 
ized olivine. 
H. Leucite ( ?) shoshonite lava sheet, mountain east of Pyramid Peak. 
Shoshonose. Contains feldspars, olivine, serpentine, augite, magnetite, 
brown mica, and impure leucite (?). 
I. Olivine-free shoshonite dike, northeast of Indian Peak. Sho- 
shonose. Contains augite, plagioclase, biotite, and magnetite. 
J. Shoshonite lava sheet, Two Ocean Pass. Shoshonose. Contains 
orthoclase, serpentinized olivine, magnetite, augite, chlorite, biotite, 
apatite, labradorite. Dried at 104°. 
Analyses G, H, I by Eakins, Nos. 1371, 1375, 1379. Analysis J by 
Whitfield, No. 906. 
Si0 2 .. 
A1 2 3 . 
FeA- 
FeO.. 
MgO . 
CaO.. 
Na 2 0. 
H 2 0. 
Ti0 2 . 
PA. 
MnO 
BaO. 
Li 2 
S0 3 . 
50. 06 
17.00 
2.96 
5.42 
3.61 
S. 14 
3. 53 
3.40 
4.85 
.51 
.66 
.14 
100.28 
53.49 
17. 19 
4.73 
3.25 
4.42 
6.34 
3.23 
3.86 
2.17 
.71 
.43 
.14 
.06 
100. 02 
52.49 
17.89 
5.76 
2.08 
3.49 
7.01 
3.18 
3. 73 
2.63 
.81 
.55 
.09 
.30 
100. 01 
54.86 
17.28 
4.08 
2.28 
4.19 
5.42 
3. 94 
3.96 
2.16 
.69 
.48 
.19 
.37 
99.90 
56. 05 
19.70 
3.74 
2.32 
2.51 
4.34 
3.29 
4.44 
1. 
.66 
trace 
.06 
.IS 
100 
.V- 
